Initial Root Password Expires After LiveCD Installation

After a LiveCD installation, the root password is initially set to the same
password as the user account that is created during installation, but it is
created in an expired state. The first time you assume the root role,
you should authenticate using your own password. At this point, you will receive
a message that the password for the user root has expired, and you will
be requested to provide a new one.

If you are prompted to assume the root role after starting an administrative
command from a GNOME menu item, you will be prompted to supply a
new root password. If you are using the su command to assume the
role, the command sequence will be as follows: